In Python, how to use a C++ function which returns an allocated array of structs via a ** parameter?
- by Jon-Eric
I'd like to use some existing C++ code, NvTriStrip, in a Python tool.
SWIG easily handles the functions with simple parameters, but the main function, GenerateStrips, is much more complicated.
What do I need to put in the SWIG interface file to indicate that primGroups is really an output parameter and that it must be cleaned up with delete[]?
///////////////////////////////////////////////////////////////////////////
// GenerateStrips()
//
// in_indices: input index list, the indices you would use to render
// in_numIndices: number of entries in in_indices
// primGroups: array of optimized/stripified PrimitiveGroups
// numGroups: number of groups returned
//
// Be sure to call delete[] on the returned primGroups to avoid leaking mem
//
bool GenerateStrips( const unsigned short* in_indices,
const unsigned int in_numIndices,
PrimitiveGroup** primGroups,
unsigned short* numGroups,
bool validateEnabled = false );
FYI, here is the PrimitiveGroup declaration:
enum PrimType
{
PT_LIST,
PT_STRIP,
PT_FAN
};
struct PrimitiveGroup
{
PrimType type;
unsigned int numIndices;
unsigned short* indices;
PrimitiveGroup() : type(PT_STRIP), numIndices(0), indices(NULL) {}
~PrimitiveGroup()
{
if(indices)
delete[] indices;
indices = NULL;
}
};
